Chimney-cowl



sfrfrs an STEPHEN M. ALLEN, OF BOSTON, MASSACHUSETTS.

CHIMNEY-COWL.

T 0 aZZ 'wh-om z't may camera Be it known that I, S'raPnnN M. ALLEN, of Boston, in the county of Suffolk and State of llvtassachusetts, have invented a new and useful Improvement in Blowers or Hoods or Cowls usually applied to the tops of chimneys for the purpose of increasing the draft of the same or preventing them from smoking, of which the following is a full and exact description, reference being had to the accompanying drawings, which, combined herewith, form my specifioation, wherein I have set forth the principles of my improvement, vby which it may be distinguished from other inventions for a similar purpo-se, together With such parts or combinations as I claim and for which I solicit Letters Patent.

Figure 1, of the above mentioned drawings is a perspective elevation of a cowl containing my improvements. Fig. 2, is an elevation of its windward end, and Fig. 3, is a perspective representation of the air cones inserted in the body of the cowl, as will be hereinafter described.

In the construction of my improved chimney blower, so far as regards a revolving right-angled tubular cap A, Fig. l-turning on the top of a cylindrical pipe B, (inserted in the upper part of a Vertical flue), by the operation of the wind on a vane C-t is the same as those heretofore used. But instead of having that end which is opposed to the quarter from which the wind blows closed, as is customary, I form the same rentering or open, by the insertion of a conical mouth-piece or head D, as seen in the drawings, into which I introduce a series of horizontal conical tubular frusta E, F, G, H, I, their ends in contact therewith being tted air tight or nearly so by flanches and rivets as seen at K, K, K, &c., Figs. 1, and 3. The number and size of these tubes may be varied according to circumstances. Their opposite ends are carried several inches beyond or project over the opening of the vertical flue, in the direction of the mouth of the cowl as seen in Fig. 3. The efiect of theintroduction of these t-ubes is as follows: The mouths of the tubes being always presented to the windward, cause the air impinging against the windward end of the cowl to be concentrated and to rush through the tubes with great velocity, and the smoke rising through the chimney, commingling with the several moving currents, is rapidly forced out by the same, thus causing the smoke and hot air below, to rise and take the place of that so discharged, by which operation a very strong draft is created in the flue, which will be increased according to the strength of the Wind.

The leeward end of the horizontal pipe or cap A or that end from which the smoke, &c., issues or is discharged, is arranged with a hollow cone L in front of the mouth of the pipe. The base of this cone is somewhat larger in diameter than the horizontal pipe and the apex comes a little within the mouth of said pipe. This cone is confined to the horizontal pipe by means of two or more curved bars or rods M M the ends of which are connected to the periphery of the base of the cone and the interior of the mouth of the pipe L as shown in Figs. 1, and 3. This arrangement of the leeward end of the pipe A of the cowl is intended to prevent the Wind from blowing down the chimney when itl rebounds or is refiected from an adjacent wall or roof or when (as frequently occurs) b anv sudden Pust of wind the discharf-V ing end is turned around to the Wndward, the conical shape being peculiarly calculated to protect the mouth of the pipe or cap A, as it deflects or reflects or stops the 'wind in whichever direction it may come and at the same time allows free egress to the smoke, &c., from the chimney. This method of protecting the mouth of the cap or pipe A is particularly essential and indeed almost indispensably necessary to smoke blowers having such an internal construction as that above described as a counter current would effectually stop the operation of the conical air pipes and destroy the utility of the smoke blower;

The method of supporting the cowl, on the chimney, so that it may be turnedabout by the action of the `windpon the vane does not difer essentially from others in common use.

Having thus described my invention 1 shall claimvProtecting the mouth or leeward end of the discharging pipe of a turning cowl by a hollow cone, the diameter of the base of which shall be somewhat larger than the descripton of my said nventon and imdameter of the mouth of the dsohargng' provement I have hereto set my signature 10 pipe; and I also claim the combnaton of this twenty fifth day of February in the year the said cone With the ooneal air tubes areghteen hundred and forty tWo.

l 5 ranged in the interior of the dschargng STEPHEN M. ALLEN. pipe, the whole being eonstruoted and op- WVtnesses: eratng substantally as above described. R. H. EDDY,

In testmony that the foregong is a true EZRA LINooLN, J r. 

